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can someone clarify this? Probability of selecting student

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Manager
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can someone clarify this? Probability of selecting student [#permalink] New post 12 Aug 2006, 06:23
can someone clarify this?

Probability of selecting student from senior class 60/1000 ==> CORRECT

but it also says,
the probability of selecting a member of the pair from junior class is 1/800.
Isn't it 60/800 ?
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 [#permalink] New post 12 Aug 2006, 10:18
Hi rkatl

The prob for selecting a senior from the class is number of senior siblings/ total number of students, hence 60/1000.

The second probability is 1/800 because the total set of juniors is 800 and there is only 1 matching sibling for the senior you have selected (although just selecting any sibling would be 60/800)
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 [#permalink] New post 12 Aug 2006, 10:36
got it.. thanks, gmatornot
  [#permalink] 12 Aug 2006, 10:36
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can someone clarify this? Probability of selecting student

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